What is the primary purpose of a firewall?

The primary purpose of a firewall is to protect a network by controlling the incoming and outgoing traffic based on predetermined security rules. Firewalls serve as a barrier between a trusted internal network and untrusted external networks, such as the internet. By analyzing the data packets that attempt to enter or exit the network, firewalls can block or allow traffic based on the established security policies. This functionality is crucial in preventing unauthorized access, cyber threats, and data breaches, ensuring the integrity and confidentiality of the networked systems.

In contrast, enhancing internet speed, storing sensitive information securely, and regularly backing up user data are not fundamental functions of a firewall. While these activities may contribute to a better overall IT security posture or user experience, they do not describe the essential role of a firewall in network security.